红层锚杆抗拔力学性质模型试验研究

Model Test Research on the Red Layer Anchors’Mechanical Properties of Pullout Resistance

为了解红层软岩的崩解特性对锚杆力学性质影响的规律,设计了红层软岩中锚杆抗拔试验和红层软岩的耐崩解试验.首先通过红层锚杆抗拔试验,得到了红层锚杆在循环荷载下的荷载-位移曲线(P-S)和荷载-弹/塑性位移曲线(P-Se,P-Sp)的演化规律,然后通过耐崩解试验得到红层软岩的耐崩解指数Id2,最后将锚杆的力学性质与红层软岩的耐崩解指数Id2联合起来进行分析.分析表明,随着耐崩解指数的降低,红层锚杆抗拔力学性质变差.

Slopes with red beds are often reinforced by anchors.But the disintegration characteristics of the red sandstone have direct influence on the mechanical properties of the anchors.Thus,it is required to study the laws between the disintegrating resistance characteristics of the red sandstone and the mechanical properties of the anchors.In this paper,anchor pullout tests in red sandstone layers and disintegrating resistance tests of red sandstone were carried out.Firstly,the evolution rules of the load-displacement curves and the loading elastic-plastic displacement curves of the anchors in red beds under cycling loads were obtained through anchor pullout tests.Secondly,the disintegrating resistance index was acquired under the disintegrating resistance tests.At last,the laws between the disintegrating resistance characteristics of the red sandstone and the mechanical properties of the anchors were combined.The analysis shows that,with the reduction of disintegrating resistance index,the mechanical properties of the resistance of pullout become poor.